javascript实例说明

Question

我只是在玩instanceof操作符。我想知道我的理解是否正确与否

var C = function(){}; 
// in the above statement C has a "prototype" property which points to an object which has 
// the constructor property which points to C constructor 
var o1 = new C(); 
// in above statement o1.__proto__ is points to C.prototype. that means inheriting from C.prototype. 
console.log(o1 instanceof C) // returns true 
//instanceof will check o1.__proto__ is equals to C.prototype(recursively until it finds null object). 
C.prototype = {}; 
console.log(o1 instanceof C) // false; 
in the above case o1 was inherited from C.prototype which points to the different object not the present C.prototype object (empty object). so the instanceof condition check fails hence its false. 

，请告诉我，如果我的解释是错误的

Answer 1

是，instanceof检查的对象的原型链的构造，并返回true，如果通过构造函数在任何地方都可以找到。所以如果你销毁一个函数的原型，就像你用一个空的对象覆盖它一样，那么instanceof将总是返回false。